Method of preventing punctures in electric flame-arc furnaces.



E. TROYE.

G PUNCTURES SN ELECTRIC FLAME ARC FURNACES. APPLICATION FILED we. 13. 1914.

METHOD OF PREVENTIN Pa'tented July 27, 1915.

criuc EINAR TRO'YE, G? CHRISTIANIA, NGRWAY, ASSIGNOE TG' NOESK -HYDRO-ELEKTBISK KVAELSTOFAKTIESELSKAB, 9F CHRISTIANIA, NORWAY.

METHOD OF PREVENTING PUNCTURES IN ELEGTLRIC FLAME-ABC FURNAES.

Specification of Letters Patent.

racemes July 27, 1915.

Application filed august 13, 1914. Serial No. 56,600.

To all whom it may concern:

Be it known that I, EINAR TROYE, a subject of the -lsiing of Norway, residingnt Solligaten 7, Christiania, Norway, have in: vented certain new and useful improve- 'ments in Methods of Preventing Punctures companying drawings, and to letters or figures of reference marked'thereon, which earth for the sake of safety. It has been tried to reduce this danger by making the lining of the furnace or the brick wall with ample dimensions. But hereby many inconveniences and increased expenses are caused, without the purpose being attained with any certainty.

The applicant has now found that it is possible to reduce the thickness of the brick wall in a considerable degree and to obtain completely puncturefree furnaces by arranging between the brick wall and the wall of the furnace (in the following indicated as the cover of the furnace) one or more air spaces, through which may flow comparatively cold air, for instance a part of or the Whole quantity of air, which is to be treated in the furnace. If the furnace is made for supplying gases of different composition or temperature it may be desirable or necessa1y-to undertake a corresponding division of the insulating air space. The insulation will of course be best; if the air space is put under pressure or if a plurality of air spaces is arranged outside of m.

other, viz. by inserted detached Walls of asbestos or the like.

By this method the applicant has as mentioned obtained completely punctureless furnaces, a result which has not been possible by the use of compact brickwork. It has also been proved, that the walls are spared in a considerable degree, because the temperature in the brick wall is more uniform. At the same time higier tempera tures, smaller dimensions and a smaller flame space can be maintained and an improvement in the yield is attainedpby the fact that the current loss in the earth is avoided.

The invention is illustrated in the accompanying drawing by a vertical section through a furnace in which 1 indicates the iron mantle, 2 the brick wall of the furnace, 3 the air supply apertures and 4 the space between mantle an wall; 5 are the electrodes Claims:

1. The method of preventing punctures in electrioflame arc furnaces, which consists in conducting gas or air streams of a suitable temperature and pressure between the furnace wall or lining and the cover of the furnaces.

2. The method of preventing punctures in electric flame arc furnaces, which consists in conducting gas or air streams of a suitable temperature and pressure between the furnace wall or lining and the cover of the furnaces the insulating layers of air consisting partly or completely of the air or y gas, which is to be conducted into the furnace for treatment. i

3. The method of preventing punctures in electric flame arc furnaces,' whlch comteliipei'ature and pressure from opposite sides of the furnace to the space between the furnacewa'll or lining and the cover of I the furnace, and causing said air or gas to 5 enter the furnace chamber" in jets distributed over said opposite sides.

In testimony that I claim the foregoing as my invention, I have signed my name 111 presencejoftwo subscribing Witnesses.

EINAR TROYE VVitnesses':

-M. C. GUTTORMSLY,

RUTH LmnsmM. 

